Inflatable mattress



FIG. 1 is a Front view of an inflatable mattress showing my new design;

FIG. 2 is a Rear view thereof;

FIG. 3 is a Left side view thereof;

FIG. 4 is a Right side viewthereof;

FIG. 5 is a Top plan view thereof;

FIG. 6 is a Bottom plan view thereof; and,

FIG. 7 is a Perspective view thereof. 

CLAIM The ornamental design for an inflatable mattress, as shown and described. 